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-d, --delete
Delete a user?s password (make it empty). This is a quick way to disable a password for an account. It will set the named account passwordless.
There are 2 alternatives - vote for the best!
It is safe when there is
"PermitEmptyPasswords no"
in /etc/ssh/sshd_config.
This command is useful when there is no need to have a password.
If you can do better, submit your command here.
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Voted down because it's an incredibly bad idea. I never recommend anyone do this, ever.
Voted up because I'm here to learn commands, not to be taught what to think.